The Gear,helical, cataloged under National Stock Number 3020-00-249-9927, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-249-9927 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.334 INCHES BOTH ENDS IN |
| Helix Angle | 20.6259 DEGREES |
| Hub Nominal Diameter | 2.938 INCHES FIRST END IN |
| Teeth Quantity | 18 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.595 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 65.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 2.408 INCHES IN |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 3.2055 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Spline Quantity | 18 BOTH ENDS |
| Nominal Outside Diameter | 3.715 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Spline Pitch Diameter | 2.2500 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 1.812 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 0073771-8 | 5/9 Secondary reference U.S. Government activity |
| 073771 | 5/2 Secondary reference U.S. Government activity |
| 0073771 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-249-9927 is a Gear,helical, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6695-01-310-6648. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-00-249-9927: Bore Nominal Diameter: 2.334 INCHES BOTH ENDS IN; Helix Angle: 20.6259 DEGREES; Hub Nominal Diameter: 2.938 INCHES FIRST END IN; Teeth Quantity: 18. 21 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.